Does it get rid of period cramps for a day?

I dont know BUT I DO know that rubbing clary sage essential oils on your lower abdomen does!

So 5 pellets is 30c or each pellet is 30c?

Because of the manufacturing process the company is sure you will receive the proper dose of 30c with 5 pellets. The medicine is sprayed on the sugar pellet and not all pellets may receive full coverage. However, taking one pellet or all the pellets at one time only gives you one dose of medicine, making this medicine safe if all the pellets ingested by a child or adult at one time. Time between doses increases the effect of the medicine. Taking all the pellets at once does not increase the effect. That only wastes the medicine and wastes money. Also, some people erroneously think that taking more pellets increases the potency from 30c to something stronger. It will only ever be 30c. Taking fewer pellets will not reduce the potency to anything less 30c and taking more pellets will not increase the potency to anything stronger than 30c.

Does it work for vertigo?

Not according to my Materia Medica. Google Gelsemium and Phosphorous.

Is this product any good?

It’s a great Homeopathic product and the company is established in the business. In saying that you should be versed in what it’s indicated for. I have a background in homeopathic medicines and have purchased many Boiron remedies.